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Financing Liability for Construction in Progress - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2010 | Dec. 31, 2010 | Dec. 31, 2009
Structural leasehold improvement costs incurred during construction | $ 18.9 |  |
Construction costs reimbursed by the landlord | 18.8 |  |
Fair value of the building capitalized |  |  | 6.9
Increased liability due to additional structural leasehold improvements |  | 18.9 |
Increased liability due to land lease expense |  | 0.2 |
Increased liability due to capitalized interest expense |  | $ 0.2 |

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- Definition Construction costs reimbursed by landlord. + References No definition available. + Details
Name: | hlit_ConstructionCostsReimbursedByLandlord
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair value of building construction in progress. + References No definition available. + Details
Name: | hlit_FairValueOfBuildingConstructionInProgress
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increased liability due to additional structural leasehold improvements. + References No definition available. + Details
Name: | hlit_IncreasedLiabilityDueToAdditionalStructuralLeaseholdImprovements
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increased liability due to capitalized interest expense. + References No definition available. + Details
Name: | hlit_IncreasedLiabilityDueToCapitalizedInterestExpense
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increased liability due to land lease expense. + References No definition available. + Details
Name: | hlit_IncreasedLiabilityDueToLandLeaseExpense
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Structural leasehold improvement costs incurred during construction. + References No definition available. + Details
Name: | hlit_StructuralLeaseholdImprovementCostsIncurredDuringConstruction
Namespace Prefix: | hlit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration